Belt-gearing.



F. W. CAMP. BELT GBARING.

APPLIOATION FILED Dsc. 2e, 19u.

Patented July 2,1912.

. BELT-GEARING.

specification of Letters Patent.

. Patented Jiuy 2, 1912.

Application led 'DecemberA 26, 1911. Serial No. 667,870.

To all wwm 'it magico/acera:

Be it known that. I, Fonnns'r W. CAMP,

I citizen of the United States, residing at A3 preferably by screws 5. pulley-sections 2 are held against rotation Glenellyn, in the county of Dupage and State of Illinois, have invented a certain new and .useful Improvement in Belt-Gearing, of which the followin is a full, clear, concise, 'and exact description.

My invention relates to belt gearing of the type in which the pulley is provided with a plurality of peripheral grooves for receiving independent strands of ay chain, cable, belt or the like in lieu of a single broad belt. Its obj eet is to provide a beltgearing of this type in which each strand is subjected to an equal strain at all times.

My invention contemplates a belt gearingr comprising a pulley having a plurality of .peripheral grooves which are automatically adjustable to equalize the strain upon the belt having several strands which work in said grooves The several featuresof my invention may be morereadily understood by reference to the accompanying drawings, which show the preferred embodiment of the invention, in which- 1 Figure l is a longitudinal, central section lthrough the pulley; Fig. 2 is an end elevation of the pulley; Fig. 3 is a section on the line 3-8 of Fig. l; and Fig. 4 is an end view of the hub of the pulley.

'Similar letters of reference refer to similar-parts throughout the several views.

The pulley is composed of a plurality of pulley-sections, there being two end' sections 1, l and intermediate sections 2. The

several pulley sections are ydesigned to rotate together but are so mounted as to be relatively adjustable toward or away from each other. With this end in view the end sectionsl, 1 are iiXedly secured to the hub with respect to the hub 3 by removable keys 4E, whereby said intermediate pulley-sections rotate with the hub and end sections. However, said intermediate sections 2 are free to slide longitudinally of thev huh between the end sections 1. in order that they may, when worn, be replaced. The hub 3 may be preferably keyed to the shaft -6 by a key 7. The several pulley-sections are preferably tapered toward their peripheries,v that is said peripheries The intermediate The keys 4 are removable' are wedge-shaped in cross-section, thereby providing between the several pulley-sections peripheral grooves"8 in which are received the several independent strands 9, which go tomake up the compound belt. While the strands are shown as comprising chains of wedge-shape cross-section to conform to the grooves of the pulley, it will be understood that my invention is not limited in its use to any particular type of cable,

. chain or belt.

defective or loose strand is replaced by a new one, such new strand may not have a proportionate strain brought upon it, thus' again producing unequal wear. By my invention the grooves 8 of the pulley are automatically adjustable in width or size so as to bring an equal strain vupon `each of the strands. Such adjustment of the size of the grooves is effected by the relative movement toward or from each other of the several pulley-sections. This adjustment. of the size of the grooves to provide equal lstrain upon all the strands is shown in Fig. l, wherein the several pulley sections are shown so adjusted as to cause the several chains to ride in the glrooves in such relation to the grooves t at an equal strain is brought upon the several chains. It thus follows that if one chain `becomes more loose upon the pulley than the others, the two pulley sec tions between which said groove is located will be automatically adjusted toward each other, thereby lessening the width of the pulley groove andthus automatically tig-hb ening such loose chain about the pulley. In l this way an equal tension is brought uponv the several inde endent chains or strands.

It will be un erstood that my invention is adapted for use not only where a plurality of independent strands are substituted for a single broad belt, but also to any use in j which a plurality of cables, chains, belts or the like are placed over a single pulley, such, for example, as is the case in hoisting devices; and the term compound belt as other, said pulley used in the claims is intended to be generic and to include all such plurality of cables, chains, belts or the like. While I have shown the preferred embodiment ofy my invention it will be understood that my invention is not vlimited to the par-` ticular structure shown and described. .A

What I claim is Y l. The combination with 1a compound belt composed of independent strands, of a pulley having: 4a plurality. of peripheral grooves for receiving said strands, said grooves being automatically adjustable in size to equalize the strain upon said strands. 2. The combination with a compound belt composed ofV independent 'p strands, of a pulley coxriprising a hub and `a lurality of pulley-sections mounted on saidub and se- 'cured against rotation thereon but `freel "adjustable relativel toward and romeaci eing provided with e- .11Phe1a1 grooves located etween the a jacent pulley-sections for receiving' the inde pendent strands of said belt, whereby Asaid grooves are automatically adjustable 1n size to e alize thestrain upon said strands. N 3. f he combination with a compound beltl composed of independent strands, of a pulley )comprising a hub, endv pulley-sections xedly secured to said hub, andin'terymediate pulley-sections secured against rotationA about said hub but free to slide longitudinally thereof, said pulley being provided with eripheral rooves located between the a jacent pul ey sections for rethe independent strands of said belt,

where y .said intermediate pulley-sections are automatically adjust-able to equalize the strain upon said strands.

4.v In a belt gearing device, the combina tion with a compound belt composed of independent strands of a pulley comprising a hub and pulley-sections mounted on said hub and secured against rotation on said hub but freely adjustable relatively toward and from each other, the peripheries of said pulley-sections being wedge-shaped in cross section Vto provide V-shaped peripheralv grooves between the adjacent pulley-sections or receiving independent strands, whereby the width of the ooves is automatically adjustable to equallze the strain upon said strands. v

In witness" whereof, I hereunto subscribe my name this twenty-second day of December, A. D., 1911'. f FORREST WM. GAMB? Witnesses: Y j

ALFRED H. MOOB, MOCLELLAND YoUNG. 

